Abstract
The paper presents the results of a research of the background visual effect of crispening depending on background lightness. An research on graphic reproductions with specifically designed solutions that involve the mentioned effect was conducted. Reproductions were designed through the variations of four different types of background lightness of 25%, 50%, 75% and 100% RTV (secondary stimuli), on which there are internal rectangles of lightness of 45%, 50% and 55% RTV (primary stimuli). The visual experiment was carried out through the use of the technique of simultaneous binocular harmonization with a 10 respondents. The ANOVA with repeated measures revealed statistically differences between the arithmetic means of variations in lightness for four variations of the background in all three primary stimuli. Further post-hoc analysis by Fisher identified the groups that mutually differ. The results indicate the regularities to which the effect of crispening is subjected in the selected graphic medium.
Highlights
Various psychophysical visual effects have a big impact on the unwanted change in the manifestation of color on printing substrates and other media in the system of graphic reproduction [1, 2]
The visual effects of crispening and simultaneous contrast are the effects that cause a shift in the manifestation of color, which is caused by the change of the background color; a bright background causes a dark perception of the color of the observed stimuli, while a dark background causes the opposite [3]
The paper presents the results of a research of the background visual effect of crispening, which is manifested in a particular graphic medium
Summary
Various psychophysical visual effects have a big impact on the unwanted change in the manifestation of color on printing substrates and other media in the system of graphic reproduction [1, 2]. For the primary stimuli of 45% RTV with the background lightness of 25% the effect of crispening is reflected in the shift of the manifestation of lightness whose arithmetic mean is μ25 = 2,08, with an identical value of the median Med25 = 2,08 (Tab. 5). In this case, due to the crispening effect, the primary stimulus is perceived as darker than its physical value
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